diff --git a/kernel/model/session.go b/kernel/model/session.go
index d25950deb..3c74a4ac5 100644
--- a/kernel/model/session.go
+++ b/kernel/model/session.go
@@ -340,6 +340,6 @@ func ControlConcurrency(c *gin.Context) {
 	requestingLock.Unlock()
 
 	mutex.Lock()
+	defer mutex.Unlock()
 	c.Next()
-	mutex.Unlock()
 }